It often has a transition frequency of around 3.0 MHz and 6 MHz is typical for the 2N3055A at this frequency the calculated current gain (beta) drops to 1, indicating the transistor can no longer provide useful amplification in common emitter configuration. Packaged in a TO-3 case style, it is a 15 amp, 60 volt (or more, see below), 115 watt power transistor with a β (forward current gain) of 20 to 70 at a collector current of 4 A (this may be over 100 when testing at lower currents ). The exact performance characteristics depend on the manufacturer and date before the move to the epitaxial base version in the mid-1970s the f T could be as low as 0.8 MHz, for example. 2N3055 transistors from various manufacturers.
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